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Histopathological risk factors for lymph node metastases in T1 colorectal cancer: meta-analysis

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BRITISH JOURNAL OF SURGERY
卷 108, 期 7, 页码 769-776

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OXFORD UNIV PRESS
DOI: 10.1093/bjs/znab168

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This study reviewed the association between histopathological findings and lymph node metastases in T1 colorectal cancer, finding that factors such as lymphovascular invasion, tumor budding, and depth of submucosal invasion were associated with LNMs. These distinct histopathological factors can help in selecting patients for local excision or major excisional surgery.
Background: National screening programmes increase the proportion of T1 colorectal cancers. Local excision may be possible, but the risk of lymph node metastases (LNMs) could jeopardize long-term outcomes. The aim of the present study was to review the association between histopathological findings and LNMs in T1 colorectal cancer. Methods: A systematic literature search was conducted using PubMed,Embase, and Cochrane online databases. Studies investigating the association between one or more histopathological factors and LNMs in patients who underwent resection for T1 colorectal cancer were included. Results: Sixteen observational studies were included in the meta-analysis, including a total of 10 181 patients, of whom 1 307 had LNMs. Lymphovascular invasion (odds ratio (OR) 7.42; P<0.001), tumour budding (OR 4.00; P<0.001), depth of submucosal invasion, whether measured as at least 1000 mm (OR 3.53; P<0.001) or Sm2-3 (OR 2.12; P = 0.020), high tumour grade (OR 3.75; P<0.001), polypoid growth pattern (OR 1.59; P = 0.040), and rectal location of tumour (OR 1.36; P = 0.003) were associated with LNMs. Conclusion: Distinct histopathological factors associated with nodal metastases in T1 colorectal cancer can aid selection of patients for local excision or major excisional surgery.

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